Looking at it, they're mostly not proper hieroglyphs. It might be quicker to just mess about in Photoshop, but either way I'll a look when I get a moment.I've been following your Balkan card search intently, but what you're doing in the Balkan thread is way beyond me.
Most canopic jars look like JARS. The figures I got and posted could literally be substituted for the graphics in a printable STL to make this whole sign printable. I just don't know enough about hieroglyphs to clearly read which glyphs are on the bottom of the warning, and draw them (or paste from google images) into a high rez 2D pic. My modeling skills are better than my art skills.
If someone can even just NAME the hieroglyphs !!!! Then I can get the images and make the sign myself.
I definitely agree about the four sons of Horus, it also looks like they have canopic jars at their feet (or at least 3 of them do).